I enjoy moving things around to get a different look in my place. That's why I like vases and pillows. They can be moved on a whim. And they don't have to be expensive. The Goodwill and Salvation Army have plenty of lovely vases. When you're done with a vase, you can redonate. Throw pillows are a great way to experiment with color.
Wanna add pink, but hubby doesn't like pink? Try a pillow. Need a little sophistication for a dinner party? Add black pillows. Reasonably priced pillows can be obtained at Marcs, Burlington Coat Factory, TJ Maxx and Amazon. Careful with Amazon, though. It's addicting. When you tire of a pillow, Etsy is a great place to buy artisan pillows covers. Many are even washable.
Here's a couple of ways I have used pillows in my place. I don't care that I am breaking the rules by using too many pillows. I love the cozy bohemian feel of pillows thrown all over, even on the floor. A contradiction for a striving minimalist, I know.